diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 7e3ca011..a59a629b 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -41,7 +41,7 @@ jobs:
             uv-${{ runner.os }}
 
       - name: Install deps
-        run: cd api && uv sync --dev
+        run: cd api && uv sync --dev --locked
 
       - name: Run tests
         run: cd api && uv run pre-commit run --all-files